Asco Hydramotor AH2D Series User manual

Page 1 of 6 (Section 1 of 2)
50 Hanover Road, Florham Park, Ne Jersey 07932 .ascovalve.com
MM All Rights Reserved.
Printed in U.S.A.

Installation & Maintenance Instructions
Form No.V8714-Sec. 1
HYDRAM T R PUSH-TYPE LINEAR ACTUAT R
AH2D
SERIES
(Section 1 of 2)
WITH WATERTIGHT ENCL SURE
WARNING
To prevent the possibility of death, serious injury or
property damage, the Hydramotor Actuator must be
installed and serviced only by a qualified service
technician avoiding the following hazards:
SElectrical hazard. Turn off all electrical power to
Hydramotor Actuator. More than one circuit may
exist.
SPressure hazard. Depressurize valve and vent
hazardous or combustible fluid to a safe area before
inspection or removing the actuator or valve from
service.
SExplosion,Ă fire or toxic Ăgas Ăhazards. Extinguish all
open flames and avoid any type of sparking or
ignition during leakage testing.
Service Notices
These instructions are divided into two sections. Be sure to
read, ĂĂunderstand ĂĂĂand ĂĂfollow ĂĂallĂ Ăinstructions onĂ
Form No. V8714 Section 1 and 2.
See separate V710 Gas Valve Installation and Maintenance
Instructions for information on: Operation, Positioning,
Mounting, Piping, Strainer or Filter Requirements, Flow
Controls, Preventive Maintenance, and Cause of Improper
Operation.
DESCRIPTION
AH2D Hydramotors are self-contained linear, push-type
actuators which extend when powered and retract by spring
force upon power interruption.
The AH actuator is typically used for control of gas-fired
heating equipment, commonly to open and close a al e or
both a al e and damper. AH2D actuators position V710
Series gas al e assemblies.
OPERATION
Application of electrical power simultaneously dri es an
electric pump and closes a normally-open dump al e,
resulting in up to 250 pounds of force on the actuator stem. This
extends the actuator stem and attached al e poppet, to open
the al e and/or damper.
Upon reaching the fully extended position, a tra el limit switch
interrupts power to the electric motor while maintaining power
to the dump al e, thus stabilizing hydraulic pressure to hold
shaft position. Position indicators on both sides of the actuator
show the actual position of the al e stem.
Upon power interruption, the dump al e opens releasing
hydraulic pressure, allowing the return spring to retract the
stem and close the al e fully. Closing time is one second or
less.
OPTIONAL FEATURES
Damper Shaft Arm All components to mount damper
arm on right side of actuator. A ailable with or without
return spring.
Auxiliary Switch One or two integral SPDT switches,
field adjustable to actuate at any position of stroke.
Overtravel Proof of Closure Switch A single factory set
non-field adjustable SPDT switch to be used in conjunction
with V710 Series Gas Val es with o ertra el seal (V22 or
V25 suffix in catalog number).
Figure 1. AH2D Actuator (sho n mounted
on V710 Series Gas Valve)
Figure 2. Cuta ay Vie (de-energized)
Cover
scre
Conduit
knockout
(4)
Nameplate/
electrical
cover
Damper arm
(optional)
AH2D actuator assembly
Do nstream
pressure tap
Upstream
pressure tap
Oil fill plug
Reservoir
Hydraulic
fluid level
Mounting
gasket
Mounting set
scre (4)
Travel limit
s itch
Piston
Actuator stem
Internal
spring
Valve
assembly
Valve stem
position
indicator

50 Hanover Road, Florham Park, Ne Jersey 07932 .ascovalve.com
Form No.V8714 - Sec. 1
Page 2 of 6 (Section 1 of 2)
SPECIFICATIONS
Force Output: 250 lbs
Stroke: 1 1/8 maximum
Electrical Characteristics:
perating Amperes (nominal)
perating
Voltage * Inrush Running Holding
24V/50-60Hz
120V/50-60Hz
240V/50-60Hz
28.00
5.60
2.80
8.00
1.85
0.92
0.73
0.11
0.05
*50 Hz construction increases opening time 20%.
Opening Time: Fast Opening: 6 to 14 seconds
Slow Opening: 14 to 26 seconds
Note: Opening time doubles between -30F to -40F
(-34C to -40C). Timing not field adjustable.
Maximum Closing Time: One second
Temperature Limitations: Ambient -40F to 150F
(-40C to 66C)
Damper Arm Rating: Dri es damper in one direction only.
20 lb maximum at 2.85 in. radius at 20F to 150F
(-7C to 65C ) and 10 lb maximum at -40F to 20F
(-40C to -7C).
Damper Arm Travel: 2 maximum
INSTALLATION
Before installation, check nameplates to erify actuator and
al e selected are appropriate for the application.
IMPORTANT: After actuator installation, test all functions
and check out complete system before putting actuator/valve
into service.
Positioning/Mounting
Follow the V710 Series Gas al e and/or damper
manufacturer's instructions when installing the Hydramotor.
1. AH2D actuators can be installed to operate in any
position.
2. Install mounting gasket and position the actuator to
operate the al e (and damper if appropriate). Secure
actuator with the four mounting set screws. Torque set
screws to 80 ± 5 in-lbs [9,0 ± 0,5 Nm] using a 5/32 hex key
wrench.
3. For damper applications requiring the damper arm to
return upon power failure, the optional return spring and
spring plug (kit 440018) must be installed on the damper
arm. Connect linkage so that damper returns to the
desired position.
Wiring (Refer to Figure 3)
WARNING: Electrical hazard. To prevent the
possibility of death, serious injury or property
damage, open all circuits before inspection, service
or disassembly. Reassemble before operating.
Wiring must comply with local codes and the National
Electrical Code. Limit controls must conform to actuator
rating ( oltage, amperage, hertz). Wiring to meet NEC Class
I, suitable for 75 C. Wire limit controls to the hot side of power
supply.
1. Route wiring through one of the conduit knockout
openings. Install appropriate electrical fittings.
2. Connect the power wiring to terminals N (neutral) and L1
(hot). A green grounding screw with a cup washer is
pro ided beside the terminal strip for grounding.
3. Torque terminal screws to 8 to 12 in-lbs [0,9 to 1,3 Nm].
4. Connect auxiliary or al e o ertra el proof-of-closure
switch wiring to the common and normally open or
normally closed switch terminals.
5. Install nameplate/electrical co er with gasket and screws
(6) on actuator housing. Hand thread screws as far as
possible, thenĂĂ torque Ăscrews Ăe enlyĂ Ăin a ĂĂcrisscrossĂĂ
mannerĂto 30 to 35 in-lbs [3,4 to 4,0 Nm].
6. Operate actuator (complete system) through fi e cycles to
erify proper operation.
Figure 3. Typical AH2D Actuator Wiring.
Travel limit s itch
Auxiliary s itch
Grounding scre ith cup asher
Auxiliary and Overtravel Proof of Closure
Switch Ratings
15 Amps 120 Vac
7.5 Amps 240 Vac
Total connected load of auxiliary and o ertra el proof-of
-closure switches not to exceed 1800 VA.
CAUTI N: vertravel Proof-of-closure switch
must only be used with V710 Series Gas Valves
having an overtravel seal (V22 or V25 Suffix in catalog
number).

Page 3 of 6 (Section 1 of 2)Form No.V8714 - Sec. 1
50 Hanover Road, Florham Park, Ne Jersey 07932 .ascovalve.com
Overtravel Proof of Closure Switch
The optional al e o ertra el proof-of-closure switch is set at
the factory to pro ide both a mechanical and electrical means
of pro ing al e closed position interlock to the primary
control. This switch is not to be field adjusted.
Auxiliary and Overtravel Proof of Closure
Switch Combinations (Partial Views)
Optional
Left side Right side
T o Auxiliary S itches
AuxiliaryOvertravel proof-of-closure
Left side Right side
T o Auxiliary and One Proof-of-Closure S itch
Auxiliary s itches
Overtravel Proof-of-Closure & Auxiliary S itches
Overtravel proof-of-closure
Auxiliary Switch Adjustment (Refer to Figure 4)
1. Remo e window screws(4) and window with gasket.
2. Loosen the camlock screw no more than 1/2 turn.
3. Reset the cam adjustment screw to the desired switching
point and hold this screw until camlock screw is tightened.
4. Tighten the camlock screw. Cycle the actuator to erify
the switch setting and readjust as required.
5. Reinstall the window with gasket and torque screws
e enly to 14 to 16 in-lbs [1,6 to 1,8 Nm].
Figure 4. Auxiliary S itch Adjustment.
Cam adjustment scre
Cam lock scre
Windo gasket
Windo
Windo scre (4)
Partial Side View of
Actuator
MAINTENANCE
Maintenance should include annual inspection and cleaning.
Use a cleaning fluid compatible with actuator components to
remo e dirt and oil. Organize a maintenance schedule based
on en ironment and frequency of use. Check for loose
electrical and mechanical connections and replace damaged
parts. Before inspection, maintenance or rebuild, review
WARNING statements on page 1.
Field Service Notice
Field service replacement kits are limited to the following:
1. Tra el limit switch Replacement Kit 440014.
2. Left side auxiliary switch Replacement Kit 440002.
3. Right side auxiliary switch Replacement Kit 440003.
4. O ertra el proof-of-closure switch Replacement Kit
440004*.
5. Right side combination auxiliary and o ertra el
proof-of-closure switch Replacement Kit 440012*.
6. Damper arm Replacement Kit 440018 (with spring and
spring plug) or 440019 (without spring and spring plug).
7. Oil Replacement Kit 440008.
8. All gaskets and screws for enclosure Replacement Kit
440020. This kit contains the following:
Nameplate/electrical co er gasket and screws
Right & left window gasket and screws.
Val e/actuator mounting gasket and mounting set
screws.
To order, specify the kit or part number, as well as the actuator
model and serial numbers.
*Separate instructions pro ided with replacement kit.

50 Hanover Road, Florham Park, Ne Jersey 07932 .ascovalve.com
Form No.V8714 - Sec. 1
Page 4 of 6 (Section 1 of 2)
Travel Limit Switch Replacement (Refer to Figure 5)
1. Remo e the six co er screws and nameplate/electrical
co er with gasket.
2. Disconnect wiring from tra el limit switch.
CAUTI N: Label wires before disconnecting.
3. Remo e two mounting screws and the tra el limit switch.
4. Reinstall new tra el limit switch in actuator. Torque
mounting screws (2) e enly to 20 to 25 in-lbs [2,3 to 2, 8
Nm].
5. The required stroke is 1 1/8  1/16. Turn adjustment
screw located abo e limit switch until the desired stroke
is achie ed. Turn the adjustment screw clockwise to
decrease stroke and counterclockwise to increase stroke.
6. Operate actuator (complete system) through fi e cycles to
erify proper operation.
7. Reinstall nameplate/electrical co er with gasket and
screws (6) on actuator housing. Hand thread screws as far
as possible, then torque screws e enly in a crisscross
manner to 30 to 35 in-lbs [3 ,4 to 4, 0 Nm].
Auxiliary Switch Replacement (Refer to Figure 6)
1. Remo e six co er screws and nameplate/electrical co er
with gasket.
2. Disconnect auxiliary switch wiring.
CAUTI N: Label wires before disconnecting.
3. On auxiliary switch side of actuator, remo e window
screws (4) and window with gasket.
4. Remo e auxiliary switch mounting screws (2) from side of
actuator.
5. Disengage auxiliary switch from indicator bar and remo e
switch from actuator.
6. Install new auxiliary switch and reassemble in re erse
order of disassembly.
7. Torque auxiliary switch mounting screws (2) e enly to 14 to
16 in-lbs [1, 6 to 1,8 Nm].
8. Torque terminal screws 8 to 12 in-lbs [0, 9 -1, 3 Nm].
9. Reinstall the window with gasket and torque screws
e enly to 14 to 16 in-lbs [1,6 to 1,8 Nm].
10. Reinstall nameplate/electrical co er with gasket and
screws (6) on actuator housing. Hand thread screws as far
as possible, then torque screws e enly in a crisscross
manner to 30 to 35 in-lbs [3 ,4 to 4, 0 Nm].
11. Operate actuator (complete system) through fi e cycles to
erify proper operation.
Figure 5. Travel Limit S itch Replacement.
Main terminal
Travel limit s itch
Adjustment scre
Mounting scre (2)
Partial Cutaway View
Connect to
Terminal 3
Connect to
Terminal 4
CAUTI N: Label wires before disconnecting.
Figure 6. Auxiliary S itch Replacement.
Auxiliary s itch Position indicator bar
S itch mounting scre (2)
Partial Cutaway View (Right Side)
Windo ith gasket
Windo scre (4)
CAUTI N: Label wires before disconnecting.
Continued on Form No. V8714-Section 2.

Page 5 of 6 (Section 2 of 2)
50 Hanover Road, Florham Park, New ersey 07932 www.ascovalve.com
MM All Rights Reserved.
Printed in U.S.A.
e
Installation & Maintenance Instructions
Form No.V8714-Sec. 2
HYDR MOTORr PUSH-TYPE LINE R CTU TOR
H2D
SERIES
(Section 2 of 2)
WITH W TERTIGHT ENCLOSURE
NOTICE: For instructions, see Form No. V8714-Section 1.
Damper S aft Arm and Spring Replacement
(Refer to Figure 7)
1. Disconnect damper shaft arm from existing system
linkage.
2. Remove retaining ring from end of damper shaft.
. Slip damper shaft arm, spring plug and return spring (if
present) off damper shaft.
4. Reassembly in reverse order of disassembly paying careful
attention to exploded view in Figure 7.
5. Reconnect existing system linkage to damper shaft arm.
6. Operate actuator (complete system) through five cycles to
verify proper operation.
Note: Damper shaft arm replacement kits are supplied with or
without return spring and spring plug. See Field Service Notice
in Section 1 page of 6.
Partial View
Retaining ring
Spring plug
Return spring
Damper shaft arm
Figure 7. Damper Shaft Arm & Return Spring.
Refilling Hydramotorr Actuator wit Hydraulic Oil
and Purging Entrapped Air
1. When refilling a Hydramotorr Actuator with oil, it is
recommended that the actuator be energized and
de-energized during filling (if possible). This is
particularly important if the oil level in the reservoir is
very low or empty. By operating the actuator, entrapped
air ĂĂis ĂpurgedĂĂ fromĂ ĂtheĂĂ hydraulicĂ Ăsystem. ĂĂĂIf Ăupon
energizing the Hydramotorr Actuator the actuator fails
to move, delays or operates slowly, chances are air has
become entrapped in the hydraulic system.
Remove entrapped air from the hydraulic system by
cycling the actuator 4 to 5 times successively over the full
stroke. As air is purged, check oil level and add oil if
necessary. All of the air has been removed when the
actuator stem moves immediately upon energizing.
2. With Actuator Mounted Upright, (Figure 2), remove oil fill
plug and fill to bottom of fill port, follow instructions
provided in step 1.
. With Actuator Mounted On Its Side, and oil fill plug
uppermost, remove the oil fill plug. The oil level should
be 5/8I from the top of the pump cover. Follow
instructions provided in step 1.
4. Reinstall fill plug and torque to 114 to 120 in-lbs 1 to 14
Nm].
5. If actuator has been repositioned, return unit to normal
orientation.
6. Operate actuator (complete system) through five cycles to
verify proper operation.
Continued on page 6 of 6.

50 Hanover Road, Florham Park, New ersey 07932 www.ascovalve.com
Form No.V8714 - Sec. 2
Page 6 of 6 (Section 2 of 2)
1.75 [44]
1.66 [42]
3.16 [80]
5.18 [131]
10.52 [267]
6.25 [159]
[220]
8.64
[90]
3.53
Four set screws for
mounting to V710 valve
Optional damper
shaft and arm
∅[60]
∅2.38
∅.875 [∅22.2] knockout for
1/2 conduit connection, 4 places
2.82 [72]
[68]
2.66
Figure 8. Dimensions
∅.25 [∅6,3]
3 holes